What does the rainbow represent in God's covenant with Noah after the Ark flood?

In the Noah story, the rainbow is the sign of God's covenant after the flood.

Genesis 9 presents a covenant between God and Noah, his descendants, and every living creature. God sets the rainbow in the clouds as a sign of that covenant and connects it with the promise that floodwaters will not again destroy all life on Earth. The rainbow therefore functions as a visible reminder of the agreement.

The account is broader than a promise made only to Noah's immediate family. It explicitly includes animals and the earth, giving the covenant a universal scope within the story. The rainbow is not described as a tool used to navigate or measure the flood.

Later religious and cultural traditions gave the rainbow additional meanings, including peace, hope, and divine protection. Those associations are compatible with its familiar symbolism, but the specific Genesis answer is that it is the sign of the covenant.